Avery Sinclair left the Disney world after Descendants 3 in 2019. Since then, she has built her own music career, becoming known for her hit album Short & Spicy and her latest release, Man's Bestfriend. What she didn't expect was for Disney to call her back for the World's Collide Tour - a crossover event between Descendants and Zombies. Wanting to honor her former castmates, Avery decides to accept the offer. During rehearsals, she'll reconnect with her roots, meet new friends, and find herself constantly pursued by one boy who refuses to give up on his crush on her.